ML20055H997

Ack Receipt of 900430 & 0713 Ltrs Re Allegation on Breaker Failure on Cooling Tower Sys.Investigation Found Sufficient Indicating That Load Ctr 106 Located Outside Security Fence Was nonsafety-related

ML20055H997
Person / Time
Site:	Monticello
Issue date:	07/26/1990
From:	Miller H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Eliason L NORTHERN STATES POWER CO.
References
NUDOCS 9007310243
Download: ML20055H997 (2)

Text

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JUL 2 C 1990 T

Docket No. 50-263 l Northern States Power Company -

ATTN: Mr. L. R. Eliason r Vice President, Nuclear d e,l Generation 414 Nicollet Mall Minneapolis, MN 55401 '

Gentlemen:

f Thank you for your letters dated April 30 and July 13, 1990, in response i to our letter dated February 27, 1990, and our telephone conversation of June 18, 1990, concerning allegations pertaining to the evaluation of a breaker failure (Load Center 106) on the cooling tower system at the Monticello NuclearGenerating. Station (AllegationRlll-90-A-0013).

in our letter and telephone conversation, we requested that you address, as a minimum, specific questions regarding the allegation and submit the results of your investigation to the NRC.

Your response indicated that Load Center (LC) 106 was a nonsafety-related i power supply and was located outside the security fence, within the o,iner l controlled area, near the cooling towers. Therefore, no quality assurence requirements were imposed for the investigation and repair of LC 106. m ,

addition, your investigation indicated that no deficiencies were identified as a result of the issues identified by the alleger. We found your investigatie sufficient to support your conclusions and we have no additional questions-regarding this matter. We request that you retain the supporting documentation for your investigation of this allegation for a minimum of one year from the date of this letter, in accordance with 10 CFR 2.790 of the Commission's regulations, a copy of this letter will be placed in the NRC Public Document Room.

Your cooperation with us is annred ated.

Sincerely,.

GRiGINAL SIGMD 0( 'HiEERT J. Wi.LER Hubert J. Miller, Director Division of Reactor Safety See Attached Distribution RIllh Rlli Rlll' e RI R 'l d Rill R 11 na Butler /jk aw Fu"n k . Gardner D ette R ng p

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' Northern States Power Company 2 JUL 2 61990 l l

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Resident inspector, Rlll Monticello- .;

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John W. Ferman,=Ph.D.,  !

Nuclear Engineer, MPCA- L State Liaison Officer, State of Minnesota ,

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